[1] Hamamatsu Univ Sch Med, Dept Family & Community Med, Higashi Ku, 1-20-1 Handayama, Hamamatsu, Shizuoka 4313192, Japan
[2] Shizuoka Family Med Program, Kikugawa, Shizuoka, Japan
[3] Kyoto Univ, Sch Publ Hlth, Grad Sch Med, Dept Healthcare Epidemiol, Kyoto, Japan
[4] Nagasaki Med Ctr, Natl Hosp Org, Omura, Nagasaki, Japan
[5] Unnan City Hosp, Unnan City, Shimane, Japan
[6] Teine Family Med Clin, Sapporo, Hokkaido, Japan
[7] Kantoh Rosai Hosp, Kawasaki, Kanagawa, Japan
[8] Okinawa Chubu Hosp, Uruma, Okinawa, Japan